physics quiz

A 1-Kg mass at the Earth's surface weighs

10 n

impulse is equal to

A corresponding change in momentum

A constant net force on a rail-road car produces constant

Acceleration

The greater efficiency achieved with the curved blades of a Pelton wheel is due to

Bouncing

An educated scientific guess is a

Hypothesis

Newton's second law directly involves

acceleration

Action and reaction pairs of forces always act on

different bodies

An objects weight is properly expressed in units of

newtons

A given net force propels an object along a straight line path by a force. If the mass were doubled its acceleration would

stay the same

For a scientific hypothesis to be valid, there must be a test for proving it

wrong

The force required to maintain an object at a constant velocity in free space is equal to

zero

The net force on any object in equilibrium is

zero